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Cambridge IGCSE Biology practice

Paper 6 structured question: Heart

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Heart

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Results from an investigation measuring heart rate before and after different levels of physical activity.

Results Table

Heart Rate Measurements

Heart rate (beats per minute) measured before and after exercise at different intensities.

Exercise IntensityResting Heart RateHeart Rate After Exercise
No exercise7070
Light exercise7090
Moderate exercise70110
Vigorous exercise70140
  1. a

    Describe the trend shown in the heart rate measurements as exercise intensity increases.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Suggest why heart rate does not change when there is no exercise.

    Aim for approximately 1 distinct marking point.

    [1]
  3. c

    Explain why heart rate is highest after vigorous exercise.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 6 structured question: Heart

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Method

Method to Investigate Heart Rate Changes

1. Measure your resting heart rate by counting your pulse for 30 seconds and multiply by 2 to get beats per minute. 2. Perform moderate physical activity (e.g., jogging on the spot) for 3 minutes. 3. Immediately after exercise, measure your heart rate again using the same method. 4. Record your results. 5. Repeat the activity and measurements two more times and calculate the average heart rate after exercise.

StepAction
1Measure resting heart rate
2Perform moderate exercise for 3 minutes
3Measure heart rate immediately after exercise
4Record results
5Repeat twice and calculate average
  1. a

    Identify the independent variable in this investigation.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Identify the dependent variable in this investigation.

    Aim for approximately 1 distinct marking point.

    [1]
  3. c

    Describe one control variable that should be kept constant in this investigation.

    Aim for approximately 1 distinct marking point.

    [1]
  4. d

    Explain why heart rate increases during physical activity.

    Aim for approximately 2 distinct marking points.

    [2]